Washboiler.



F. H. PLAISTRIDGE. WASHBOILER. APPLICATION FILED FEB 28. l9l6; 1,201,983. Patented Oct. 17,1916.

VWTNESSES: INVE'NTOR:

' ATTORNEY.

STATES ?A EN FFICE.

FRANK H. PLAISTRIDGE, 013 LOS ANGELES, CALIFORNIA.

WASHBOILER.

Specification of Letters Patent.

Application filed February 28, 1916. Serial N 0. 80,831.

To all whom it may concern:

Be it known that I, FRANK H. PLAIST RIDGE, a citizen of the United States, residing at Los Angeles, California, have invent- 5 ed a new and useful Washboiler, of which,

the following is aspecification."

My object is to make a wash boiler bottom having a flat supporting surface and having heat accumulators and conductors pressed upwardly, so as to increase the heating capacity and so as to prevent the laundry from lying flat upon the bottom; and

herein shown, described and claimed.

Figure 1 is a side elevation of a wash boiler parts being broken away and shown in section to illustrate the application of the principles of my invention in the construction of the bottom. Fig. 2 is a top plan view of a fragment of the bottom. Fig. 3 is an enlarged sectional detail of the bottom on the line 33 of Fig. 2, and illustrating the laundry resting on the apeXes of the heat conductors with water in the valleys under the laundry.

The wash boiler 1 may be of any ofthe well known or desired forms, except as to the bottom 2 which embodies the principles of my invention. The bottom 2 is formed my invention consists of the novel features from a fiat sheet. The heat accumulators and conductors 3 are pressed upwardly from the fiat surface at, are regularly spaced in rows, those of one row being staggered relative to the next row, and are circular in plan and semi-circular in elevation, and form zigzag valleys 5 between their apexes 6. When a quantity of-water' 7 is placed in the boiler it will fill the valleys 5 and thelaundry 8 will rest lightly upon the apexes 6. WVhen'the boiler 1 is set over a fire heat will collect in the cha-mbers 9 under the apeXes 6 and the water in the valleys 5 will boil up through the laundry 8. In this way the efficiency of the heat transmitting surface is increased about 25 per cent. The laundry does not lie as on a flat surface and can not be over-heated as long as there is plenty of water.

I claim:

A wash boiler bottom formed of a fiat sheet having a series of upwardly extending semi-spherical projections arranged in staggered relation to each other thereby forming zig-zag valleys between the projections.

FRANK H. PLAISTRIDGE.

Witness J AS. GRonNDYKE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, WashingtomD. C. 

